### Obtain the distance between the two charges

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Two charges are placed between the plates of a parallel plate capacitor. One charge is +q1 and the other is q2 = +5.12C. The charge per unit area on each plate has a magnitude of = 1.71 × 10-4 C/m2. The force on q1 due to q2 equals the force on q1 due to the electric field of the parallel plate capacitor. What is the distance r between the two charges?

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